Spark-plug



A. J. PERRON.

SPARK PLUG. APPLICATION FILED Aus.z4, I918.

Patented July 1, 1919.

A INVEIWOR cgiexcz nde w' ZJMW k;

A TTORNEVS ALEXANDER JOSEPH PERRON, 0F SPARTA, WISCONSIN SPARK-PLUG.

Specification of Letters Patent.

Patented July 1, 1919.

Application filed August 14, 1918. Serial No. 249,888.

To (Ii'Z Whom it "may concern:

Be it known that I, ALEXANDER J. PER- noN, a citizen of the l nitcd States, and a resident of Sparta, in the county of Monroe and State of \Visconsin, have made certain new and useful Improvements in Sparkllugs, of which the following is a specification.

My invention relates to improvements in spark plugs, and it consists in the construction, combination and arrangement of the parts. substantially as herein described and claimed.

An object of my invention is to provide a spark plug having an almost entirely closed shell for the purpose of protecting the central electrode, the floor of the shell being disposed at an angle to cause any possible accumulation of oil in the shell, to run to the drip point beneath the electrode, thus keeping the interior of the shell clean.

Another object of the invention is to provide a spark plug including a shell which is entirely closed with the exception of a single electrode slot into which the point of the central electrode extends to provide the spark gap, the central electrode and a portion of the porcelain being made square to prevent turning and disalining the point of the central electrode in screwing the packing nut down.

A further object of the invention is to provide a spark plug having the features hereinbefore described, and including a mark whereby the location of the electrode slot mav be determined, for purposes of positioning the spark gap. 7

Other objects and advantages will appear Fig. 4 18 a detail sectional perspective view illustrating how the inclined floor acts as a reflector;

Fig. 5 is a detail perspective view showing the core and the shell of the spark plug separated. the shell being shown in section;

Fig. 6 is a detail sectional view illustrating a slight modification, and, i

Fig. 7 is a sectional view of a spark plug constructed substantially like the one in Fig. l, butshowing a modified structure in the core and the mounting therefor.

On, of the important features of the spark ,i plug lies in the construction of the metal',i.=hell 1, which, when the parts of the sparkhiplug are assembled is entirely closed on th bottom with the exception of a single narrc. l electrode slot 2.

The floor 3 of the shell 1 is disposed at an angle as clearly shown in Fi 1 and 4, in order to cause the drainage 0 any such substance as oil, toward the drip point 4 where the drop forms, an shown in Fig. 4. In the first place, by almost entirely closing the shell 1. the filling of the spark plug around the central electrode 5 by means of oil. carbon and gas is almost entirely prevented.

Any oil that may find its way into the shell 1 through the slot 2 will quickly run out because it cannot stand on the inclined floor 3. The shell 1 has a threaded body 6 by means of which the spark plug is screwed into the head of an engine.

The shell 1 has a bore of a number of diameters. The bore 7 which constitutes the electrode chamber, ends in fiat walls 8 which form a square portion that is clearly shown in Figs. 2 and 5. The corresponding square end 9 of the porcelain core 10, fits in the square portion 8 and prevents the turning of the porcelain core and the disalining of the spark point of the central electrode, when the packing nut 11 is screwed down.

A boss 12 on the porcelain core fits in the counterbore 13- of the shell 1. This counterbore is threaded and receives the packing'nut 11. Gaskets 14 are located on the upper and lower sides of the boss 12 and are intended to form a tight joint when the nut is screwed down.

The central electrode 5 is square in cross section so that it cannot turn in the porcelain core 10. A collar 15 on the electrode prevents it from dropping out. The collar is molded in the core as shown. The spark point of the central electrode is at the end which is curved around and s aced the proper distance from the head 0. the electrode slot 2 where it forms the spark gap.

It will be observed at once that the pur pose of the coiiperating square end 9 of the core and the square portion 9 of the shell is. to keep the spark point of the central electrode in the true position at the head of the electrode slot and prevent the dis alinenient of the spark point when the packing nut 11 is serewed down.

In order that. the loeation ot' the spark gap may he aseertailn'd l) v sinipl v looking at the plug when it is in position in the en glue vylirnler. a suitahle mark It is made on the exposed part ol the shell direrllv in line with the elertrode slot 2. lesides sen: in; to drain the shell of oil. the ltit'lllllil lloor i l arts as a relleetor to the 'torecot' the explosion. This feature is illustrated in Fig. l h the arrows. The gas rreated h)" the explosion is made to sweep hark out of the elertrode sl t 2 and aernss the spark point of the eleetrode. therelrv clearing the slot and tendin; to keep the spark point clean.

The nmdificat'ion in Fig. leonsists simply of providing a minute drain hole 2' in alino ment with the inelined floor t. In this ease the eleetrode slot 2 is made inst large enough to art'onmnidate the spark point (it the ventral eleetrode. In this form at the invention it will ll(' olisei'v d that the shell I is closed to even a u'reater Ytvnt than is the ea e in Fig. 1: it is. the jlltrlmsw oi" thr invention to ini'lose the ventral eleetrodr a nnivh a. possihlr for tlnpinpos ot' pin t vtion.

The n'io lilieatiini in his}. 7 einliodies the inipi'n'tant elements in" the ilnention. A. the eonstrlietion ot' the shell l. a slight. de partllre being: made in the eonstrin-tion ot' the elm-trodes in that a fixed eler'trode 17 is formed at the h ad of the eleetrode slot. This formation enaliles the location of the spark point of the rentral eleetrode 5 even farther inside of the shell 1.

In this form of the invention. the central elertrode forms a part of th ventral na tallir eore 1R. whirl] is of the aame general apli earain-e of the pori'elain rore i i. A sleeve W and a hashing: 20 of insulating and heat resisting material. supports the llttlillll r-ore l in the hell of th spark plug.

'hih' the onstrin'tion and arrangement of the spark plug herein deserihed and illn trated is that of a generally preferred form, ob iously slight modifications and ehanges may he made without departing; from the spirit of the invention or the scope? of the elaims.

1. A spark plug. comprising a ventral electrode. and a shell having an eleetrode slot for receiving the point of said eleetrode to form the spark gap. said shell heing entirely elosed with the exeeption of said slot for the protection of said electrode and the. exclushin olsnhstani-es train the interior of the shell. and having" an inrlined floor acting as a retleetor to expel the gas and clear said slot and spark point.

J. spark plug,comprisin ra central elec trodin and a shell liming: an elertrotle slot for rereiving the point ol said nh-etrodo to I'orin the s|)2\ll( gap. said shell heing entirely rinsed with the exi-eption of said slot for tho protei'tion at said elei-trode. and heing pro- \aled with a lloor int-lined upwardly from the have of said slot. to l'iirin an oil drip point ll('li1\'\ said alot and to insure the drain-- age ol the spark plug.

I). in a spark plug. a sh ll having a rela" tively narrow and \ertirally disposed eleetrode slot. said shell living entirely elosed with the exeeption ol said slot and heing provided with a noireireillar portion in the burn {it the shelh a eent'ral eleetrode of non eireiilar i-ross sert ion ha ring the point turned into the elertrode slot to l'orin the spark. gap. and an insulating wire hating said eli' r-t'rode enihed'led ther -In and provided with a non lli' lllHl end to fit in will iitilrillt'llltll'1101* tlin: itll l prevent till iliwililienni'll (il the spark poin in the elm-trod" alot in I'IHFtlllllin; ill part. .1? the p \ih plug.

in a spark phil 1-h-ll havin a \'t?tirally i,;p: 1-!-il Ul i l l *ii'fll and a floor lantin a' lip than the ta te (it HIlt'l slot to drain the shell ol oil to a drip point below the slot. the bore of aid shell having a non eireular port ion and the exterior of the shell having a mark in vertieal alinement with the elertri'ide slot for the t'l'iill l'llllllttl ltjll of the spark ap when the plug is in plaee in a i'ylinder, a ventral electrode of non-rirmdar eross sertion having: the point turned into said slot to form the apark gap. an insHlat.-- ing more having the eleetri'ide ernliedi'led theiein. the elertrinle having a eollar to prevent it from dropping out. said (ore includ in a innri'irrnlar end fitting in said nonl'iiilltl' p n't n f th hell to prevent tnrir ing of the were and the disalinement of the. spark point in said slOL and a packing nut arranged to hind said core in plane.

3. A spark plug. comprising a shell having an electrode slot forming a drain opening; the shell having a floor slanting upwardly from said opening to cause fluid to run down to said opening, and being entirely closed with the exception of said slot, and a eentral electrode having a spark point turned toward the top of the slot to form the spark gap.

ALEXANDER JOSEPH PERRON. 

